Air compressor



FIG. 1 is a perspective view of an air compressor embodying the ornamental design of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in FIGS. 1-7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an air compressor, as shown and described. 